【 Weak current College 】 microphone parameters 】

(1) sensitivity refers to the microphone to a certain sound pressure can produce output voltage. Its unit is a mV/Pa.

(2) frequency response refers to the microphone sensitivity changes with frequency. General microphone frequency response range: 1OOHz-1OkHz, better microphone frequency response for 2OHz-2OkHz.

(3) the output impedance is the microphone in the 1kHz, measured output impedance, known as microphone output impedance. Output impedance at 2 k Ω in the following referred to as low impedance microphone, output impedance in 2k dish above is called the high impedance microphone.

(4) point to the sensitivity of the mean microphone with acoustic incident direction changes. The directional microphone can be divided into three types: Omni-directional, unilateral,.

Omni-directional microphone, the sound on all sides have the same sensitivity County.
Unidirectional microphone, positive sensitivity is higher than the rear sensitivity.
Bi-directional microphone, front and back of sensitivity, and the two sides of the lower sensitivity.

(5) the inherent noise is means the microphone in the absence of outside voice of the output voltage. Output voltage as small as possible.